Process of making cores for automobile-tires.



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IRA. F. TRAUTMAN, or NEW 'iffiRlif,

PROCESQ GI MARIN (JOKES 1 133. 3 AU'TGBZZOBIIiLJz'l-lll nearest,

T 0 all whom it may concern:

Be it known'that I, IRA F. TRAUTMAN, a citizen of thellnited States, and a resident of the city of New York, borough of Brooklf'yn, county of Kings, and State of New York, have invented a new and useful 1111-- provement in the Process of Making Cores for Automobile-Tires, of which the following is a specification.

' The object of my invention is to make a core for automobile tires which will have all the advantages of a pneumatic tire and none of thet disadvantages, which is made in the manner which ll will now describe.

As my improved core takes the place of a pneumatic tube in an automobile tire, it is obvious that the tire is not changed, except that my improved core is substituted for the tube. For this reason the core should fit the shoe of a tirejust the same as an infiated tube and hol the shoe with sufficient" firmness to permit its use in the conventional manner. 7

The process by which I carry out my invention is as follows: Crude rubber is first mixed with any suitable compound, such as sulfur, which enables it to be vulcanized. It is also mixed with a suitable proportion of a gas generator, such as sodium carbonate, vinegar, ammonium carbonate, alum or any other suitable gas generator,- and this mix ture, when properly formed is first made into the shape of an annulus, the crosssection of which corresponds to, but is smaller than the cross-section of the finished product, and of a size, diameter, etc., corresponding to the finished product. lVherc a heavy car is to be carried by the core, the cross-section of the annulus isa little less than .the cross-section of the fin ished product, say one-quarter of an inch less in diameter, and where a light car is to be carried, the cross-section of the annulus may be one-half or three-quarters of an inch less than the corresponding dimension of the finished product. In any event, after the annulus has been formed it is carefully wrapped by tape, which is preferably made of sea island duck, with raw rubber placed on one surface, the fabric being cut in parallel strips on bias, althou h it is obvious that any other suitable 3e may he Specification of Letters Patent.

Application filed Getober 25, 1911. Serial l lo. 656,832.

This tape is then wrapped around the nulus, much as an armature coil is wound for a dynamo, so that the ed overlap. The Wrapping differs from that of an armature coil in that the tape on the annulus is not wrapped tight, but is flexible and loose and so arranged and disposed that it will, wnen stretched taut, fit the interior of the mold with sutlicient tightness for the purposes intended, so that theannulus,when finished, will consist of sponge rubber with an exterior coating of tape fastened to the rubber whereby a sufficiently strong and firm, but not too firm, structure is established. The core when so fo med is placed in a suitable mold and Vulcan d. The vulcanization is preferably carried on in a steam vulcanizer heated to substantially 280 degrees Fart, the steam being shut oil 1!, i' i .1. W; non: LIIDQ to time to pie ent burning or excessive vulcanization of a part oi. the core while the remainder is not cured or vulcanized. The number of times the steam is turned on and oft and the length of these periods of heating and cooling will depend upon the size of the core and the consistency thereof, ditlerentmintures requiring slightly different treatment in this respect. When the vulcanizationis complete the core is re moved froin'tlie mold and is ready for use, the expanding oi the sponge rubber having filled the tape wrapping, stretched it tight and secured the wrapping to'the core.

While I have shown and described one method of carrying out my improved. processes', it is obvious that it is not restricted thereto, but is broadenough to cover all structures coming within the scope of the annexed claims.

hat 1 claim is,

'1. A process otrmaking a tire core con-- sisting in shaping a mixture of crudsrubber, sulfur and a gas generator into the fOI'ID Of an annulus, wrapping tape about the same so that the tape, when stretched es of the tape beg, sulfur-and a gas generator into the form of an annulus, Wrapping tape about the same so that the tape, when stretched on the finished product, Will fit snug against it and fill the core mold, placing this annulus in a suitable core mold and vulcanizing with seyeral heats the annulus so placed whereby a core of sponge rubber inclosed in a tight-fitting envelop is produced under pressure;

- IRA F. TRAUTMAN. Witnesses:

E. C. WIN'IRINGHAM RICHARD CANNON. .41; 

